CRS125 not working usb

Let me repeat after you: you connected USB modem, and via USB Hub it has sufficient power so no problem on this side.

The modem itself (if I recall it right) supply you with IP via DHCP, so first all all you need to add DHCP client on lte interface. Then you set up NAT from your LAN to lte interface.

The bad thing is, you have multiply NATs, one by one:

  1. at Mikrotik (from LAN to lte address; from private to private IP)
  2. at modem (from lte gateway address into the one supplied by cell provider. used to be from private to private IP)
  3. at cell provider, from private IP assigned to the lte modem to some external address (public one).

If you try to ping from Mikrotik you might need to set outgoing interface first:

ping address=8.8.8.8 src-address=<ip assigned to you by modem's DHCP>

May this be the solution?

Thanks you for your reply, Upower3.

When connecting both LTE modems via the USB HUB the Mikrotik is detecting them automatically and is adding the following DHCP client entries.
LTE_modem_008.JPG
According to my knowledge they look alright.

I will start with NAT.
I will keep you informed.

Best regards:

Erik

What’s amazes me is two lte interfaces and two IP addresses. If you have only one modem then it is strange. Take a note not to mess with same subnet on different interfaces (192.168.0.x/24 use to be wildely used around).

At the moment that I was taking the screenshot two LTE modems (one ZTE MF823 and one Huawei E3372) were connected via the USB HUB.

During configuring I removed the ZTE LTE modem. (The ZTE one has less antenna gain, so I prefer the Huawei)

I will keep you informed.

Erik, maybe you need to disable others routes for test and leave only one lte?
check my dynamic routes, they have some different than your
10.88.0.1 - my MK ip (default gateway on my network)
192.168.8.1 - lte modem
192.168.8.100 - ip given by modem`s dhcp to MK usb port
Снимок.PNG

When I am trying to add NAT, I see that a few entries are automatically made by UPnP (Universal Plug and Play) equipment This normally makes intelligent connections between two pieces of UPnP-equipment possible on port-level. They normally can exchange the IP-addresses used and have dynamic access to the internet.
LTE_modem_009.JPG
I have switched on the UPnP at the Huawei E3372 modem, however it doesn’t add any NAT in the list.
More settings on the Huawei LTE modem are not available.

Will the network mask 192.168.0.0 /16 also take the range 192.168.8.0?
How does the Mikrotik read its configuration? First line first or more precise line first?

I will try to test tonight with the ZTE LTE modem and see how this behaves.

/16 - its all subnets 0.0.0.0 - 0.0.255.255
usually you need to set masquarade NAT rule for new interface to access inet
Снимок.PNG

Dear Y2kir,

My current routes are as follows:
LTE_modem_010.JPG
According my knowledge this should be OK.
Anyway at this moment I not allowed to pull the primary internet connection, otherwise my family will kill me. :slight_smile:

Erik, i think you need to set NAT masquarade rule to access net through new lte connection

I have added the NAT masquerade rule and I can now reach the GUI of the Huawei modem at 192.168.8.1 using the browser.
LTE_modem_011.JPG

i think all will be ok now with you
In my original post problem was with lte interface that dont created after usb modem connect but i see that you havent any problems even with a two modems, to access inet just need add correct config now

i will try this weekend with my crs125, maybe last routeros update make some fixes and my lte will work ok too

OK Y2kir,

I can reach both LTE modems and their GUI (using a browser), but I can not connect not the internet yet.
I agree that the USB of the Mikrotik is working.

Good luck and I will keep you posted when I am able to get everything up and running.

Best regards:

Erik

You can look this manual there a two wan addresses and NAT setup
Its on russian, but google translate or chrome autotranslate will help
https://spw.ru/educate/articles/natpart3/